$1.$ Suppose we have two infinite planes. One is the x$-$y plane, and the other is parallel, but goes

through z $=25$ cm$.$

a$.$ If the plane at $25$ cm is at $10$ Volts, and the plane at $0$ cm is at $0$ Volts, where is the plane

that would have a voltage of $5$ Volts?

b$.$ The electric field is constant between two such planes, but in which direction does the

electric field point?

c$.$ If the planes were finite, what should the field look like a long distance away?

$2.$ A positive test charge is released at rest from one plane that has an electric potential of $5$ Volts

to another that has an electric potential of $-5$ Volts. It has a mass of $15$ grams and a charge of $2$

microColoumbs. How fast is it moving when it hits the other plane? Note that the potential

energy is $($charge$)*($Voltage$),$ and one can use conservation of energy to solve this problem.